MAGETWO-95386: Fixed incorrect design exceptions functional

Author: roman

app/code/Magento/Theme/Model/Design/Backend/Exceptions.php

@@ -8,7 +8,6 @@
 use Magento\Config\Model\Config\Backend\Serialized\ArraySerialized;
 use Magento\Framework\App\ObjectManager;
 use Magento\Framework\Unserialize\SecureUnserializer;
-use Psr\Log\LoggerInterface;
 
 class Exceptions extends ArraySerialized
 {
@@ -182,7 +181,6 @@ private function validateValue($value)
             if (is_string($value)) {
                 $this->secureUnserializer->unserialize($value);
             }
-
         } catch (\InvalidArgumentException $e) {
             $this->_logger->critical($e->getMessage());
             $value = false;

lib/internal/Magento/Framework/View/DesignExceptions.php

@@ -6,7 +6,7 @@
 namespace Magento\Framework\View;
 
 use Magento\Framework\App\ObjectManager;
-use Magento\Framework\Unserialize\Unserialize;
+use Magento\Framework\Unserialize\SecureUnserializer as Unserialize;
 use Psr\Log\LoggerInterface;
 
 /**
@@ -89,7 +89,7 @@ public function getThemeByRequest(\Magento\Framework\App\Request\Http $request)
 
         try {
             $expressions = $this->secureUnserializer->unserialize($expressions);
-        } catch (\Exception $e) {
+        } catch (\InvalidArgumentException $e) {
             $this->logger->critical($e->getMessage());
             return false;
         }